package com.tanhua.server.interceptor;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.tanhua.server.utils.Cache;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.MethodParameter;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.http.MediaType;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.http.server.ServletServerHttpRequest;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

import java.util.concurrent.TimeUnit;

/**
 * @description:
 * @author: Administrator
 * @date: Created in 2021/2/16 11:30
 * @version: 0.0.1
 * @modified By:
 */
@ControllerAdvice
public class MyResponseBodyAdvice implements ResponseBodyAdvice {

    @Value("${tanhua.cache.enable}")
    private Boolean enable;

    @Autowired
    private RedisTemplate<String,String> redisTemplate;

    private static final ObjectMapper MAPPER=new ObjectMapper();

    @Override
    public boolean supports(MethodParameter returnType, Class converterType) {
        //开关处于开启状态 是get请求 包含了@Cache注解
        return enable && returnType.hasMethodAnnotation(GetMapping.class)
                && returnType.hasMethodAnnotation(Cache.class);
    }

    @Override
    public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType, Class selectedConverterType, ServerHttpRequest request, ServerHttpResponse response) {
        if(null==body){
            return null;
        }
        try {
            String redisValue=null;
            if(body instanceof String){
                redisValue=(String)body;
            }else{
                redisValue=MAPPER.writeValueAsString(body);
            }
            String redisKey=RedisCacheInterceptor.createRediskey(((ServletServerHttpRequest)request).getServletRequest());
            Cache cache=returnType.getMethodAnnotation(Cache.class);
            //缓存的时间单位是秒
            this.redisTemplate.opsForValue().set(redisKey,redisValue,Long.valueOf(cache.time()), TimeUnit.SECONDS);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return body;
    }
}
